Constructs an container, copying ``other``'s contained elements, hash function, predicate, maximum load factor, but using allocator `a`.
Constructs an container, copying `构造一个容器，拷贝`other``'s contained elements, hash function, predicate, maximum load factor, but using allocator所包含的元素、哈希函数、谓词和最大负载因子，但使用分配器 `a`.。
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Constructs an container, copying `构造一个容器，拷贝 `other``'s contained elements, hash function, predicate, maximum load factor, but using allocator所包含的元素、哈希函数、谓词和最大负载因子，但使用分配器 `a`.。